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DERIVATIVE AND HEDGING ACTIVITIES - Realized Unrealized (Details) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Oct. 31, 2019	Dec. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Derivative and hedging activities
Financial Designation, Predecessor and Successor [Fixed List]	Successor	Successor	Successor	Predecessor	Successor	Predecessor	Successor
Total net gain (loss) on derivative contracts			$ (34,761)	$ 17,010	$ 83,538	$ (47,789)
Derivatives not designated as hedging contracts under ASC 815
Derivative and hedging activities
Financial Designation, Predecessor and Successor [Fixed List]	Successor	Successor			Successor
Derivatives not designated as hedging contracts under ASC 815 | Commodity contracts
Derivative and hedging activities
Total net gain (loss) on derivative contracts			(34,761)	17,010	$ 83,538	(47,789)
Derivatives not designated as hedging contracts under ASC 815 | Commodity contracts | Other income (expenses) - net gain (loss) on derivative contracts
Derivative and hedging activities
Unrealized gain (loss) on commodity contracts			(67,221)	10,764	45,157	(57,405)
Realized gain (loss) on commodity contracts			$ 32,460	$ 6,246	$ 38,381	$ 9,616

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Indicates designation of financial information when substantially all business or separately identifiable line of business transfers from one entity to another entity. Acceptable values are "Predecessor" and "Successor".

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Gain (loss) incurred in hedging activities.

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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